Sash-balance



AR. K. BROWN.

SASH BALANCE.

Patented'ne. 5, 18913.'.

v Eig-.Z

TNB Y NATloNAL LnuanAFx-tma COMPANY.

5o lifting device. It is provided with the sleeve 4the saine, reference being had to the accom- Nrrn STATES ROBERT K. BROWN, or wHITrNsviLLE, MASSACHUSETTS. y l

SASH-BALANCE.

SPECIFICATION forming part of Letters Patent No. 510,154, dated December 5, 1893.

` vApplication led January 24. 1893. Serial No. 459.530. (No model.)v

To all whom i? may concern.-

Be it known that I, ROBERT K. BROWN, of Whitinsville, in the county of Worcester and State of Massachusetts, have invented a new and useful Improvement in Window-Sash Balances; and I hereby declare that the following is a full, clear, and exact description of panying drawings, forming part of this specification.

This invention has reference to an improvement in the construction of window-sash balances in which acoiled-spring is used to balance, or partly balance, the window-sash. I The invention herein described refers to an improved locking-device for a sash-balance shown and described in my application of even date herewith, Serial No. 459,531.

The object of the invention is to so construct a sash-balance that the same may be readily locked and unlocked and thereby hold the sash in any desired position.

The invention consists in the peculiar and novel construction of the sash-balance and the locking-device, as will be more fully set forth hereinafter.

Figure 1 is a side view of the improved sash-balance shown in connection with part of a window and its frame. Fig. 2 is a vertical sectional view of the improved sash-balance shown in connection with part of a window and frame. Fig. 3 is an enlarged horizontal sectional view of the improved sashbalance and part of the window sash and frame. Fig. 4 is a side view ot' my improved sash-balance showing one form of lockingdevice, and Fig. 5 is a side view of part of the sash-balance showin ga modified form of locking-device.

Similar numbers of reference indicate corresponding parts in all the figures.

In the drawings 1 indicates the vertical stile of the window-sashes, 2 the vertical box-stile of the window-frame, 3 the case of the sashbalance which is secured to the stile of the window-frame by screws passing through anges on the upper and lower ends of the case 3.

4 indicates the shelly inclosing the spring- 5; lthis shell is adj ustably secured to the case 3 by means of the screws 6 which are screwthreaded inthe nuts 7. These nuts abut on one side against the shell 4 and are thereby kept from rotating. towardthe right the nuts are drawn toward the case 3 and this movement is transmitted to the brackets 8, made integral with the shell 4, by the coiled-springs placed between the nuts and this bracket S. Thus the shell and the spring-barrel journaled in the shell are drawn toward the face of the case 3 and toward the sash.

In the modied form shown in Fig. 5 the screw 6 is shown connected with the bracket 8 which is screw-threaded. The spring-barrel is formed of the ring 9 which has on one side the projecting annular-flange 10 and the disk l1 in the center of which is the shaft, or spindle, 12 which has its bearing in the sleeve 5 and around the periphery of which is the toothed-rim 13. A rubber-ring, or tire, 14 is drawn over the ring 9 and is held between the flanges 10 and the toothed-rim13. The coiled-spring 15 is secured at one end to the inner side of the ring 9. The toothed-rim is designed for use in connection with a locking- 'device by means of which the rotation of the spring-barrel and the rubber-tire is prevented and the window may be locked and held in any desired position. This is accomplished by means of a pawl,or pawls, connected with ank operating knob projecting from the window-casing.

In Fig. 1 the pawls 16 are pivotally secured to the shell 4. The arms 17 are pivoted to the pawls 16 below the pivotal connections ofthe pawls on the shell 4 and are connected with the push-bar 18 having the knob 19 at its outer end. -As shown in the drawings the sash-balance is locked and by drawing out are moved outward to release the toothed- By turningthese screws rim. It is obvious that by making the pushbar lS a trille longer the operation may be reversed and the pawls released by pushing the knob and push-bar inward, orlocked by drawing the same outward.

In Fig. 4 the arms 17 are pivotally connected with the pawls 16 above the pivotal IOO connection of the pawls with the shell 4. The push-bar 18' is provided with a stop and the spring 2O bears against this stop and a stop on the box 3, so that in the normal position the sash-balance is locked, and is unlocked by pushing in the knob 19 and push-bar 1S. The spring 20 may be omitted and the pushbar 18 provided with the notches shown in the drawings so as to hold the push-bar in both positions.

In the modification shown in Fig. 5 one locking pawl is directly secured to the pushbar 182. The inner end of the push-bar is provided With a pin passing .through a hole in the recess 4 formed on the shell 4. A spiralspring surrounds this pin and bears against the shell 4 and the bent end of the push-bar 182. As shown in this figure the sash-Weight is locked, and will be unlocked when the button is pushed in. The push-bar is also shown provided with a notch which en gages with the latch-plate 22 and holds the push-bar in the unlocked position.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. In a sash-balance, the combination with the case 3, the shell 4 adjustably connected with the case 3, the ring 9, the tire 14, the disk l1, and the toothed-rim 13, of a pawl or pawls operated by a push-bar to lock and unlock the sasl1-balance, as described.

2. The combination with the case 3, the shell 4 adjustably connected therewith, the ring 9, an elastic tire carried by the ring, the disk 1l, and the toothed-rim 13, of the pawls 16 pivoted to the case, the arms 17' pivoted to said pawls, and the spring-operated pushbar 18 pivote-d to the arms 17,as and for the purpose described.

In witness whereof I have hereunto set my hand.

ROBERT K. BROWN.

IVitnesses:

HENRY J. MILLER, M. F. BLIGH. 

